Effect of a lighting programme change on two breeds of laying hens.
D000818:Animals; D002645:Chickens / Q000502:physiology*; D004531:Eggs / Q000528:radiation effects / Q000592:standards*; D005260:Female; D006799:Housing, Animal; D008029:Lighting; D010058:Oviposition / Q000502:physiology*; D013045:Species Specificity